📝 The factory CSFI poppets clog and stick — rough idle, misfires, hard hot starts. GM's own fix was this MFI-style spider; it's a direct bolt-in under the upper intake, no tuning needed. The 4.3L V6 uses a different assembly.
⚠️ Verify before buying. Fitment varies by year, engine (4.3/5.0/5.7/7.4/6.5) and 2WD/4WD. Confirm against your VIN/build before ordering.